EP1759187A1 - Ir-sensor, insbesondere co2-sensor - Google Patents
Ir-sensor, insbesondere co2-sensorInfo
- Publication number
- EP1759187A1 EP1759187A1 EP05748773A EP05748773A EP1759187A1 EP 1759187 A1 EP1759187 A1 EP 1759187A1 EP 05748773 A EP05748773 A EP 05748773A EP 05748773 A EP05748773 A EP 05748773A EP 1759187 A1 EP1759187 A1 EP 1759187A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- filter
- pass band
- sensor
- filters
- detector
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000005855 radiation Effects 0.000 claims description 35
- 238000011156 evaluation Methods 0.000 claims description 10
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 239000010703 silicon Substances 0.000 claims description 3
- 229910004261 CaF 2 Inorganic materials 0.000 claims description 2
- 229910052732 germanium Inorganic materials 0.000 claims description 2
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 23
- 230000003595 spectral effect Effects 0.000 description 11
- 238000005259 measurement Methods 0.000 description 7
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 230000033001 locomotion Effects 0.000 description 4
- 238000000862 absorption spectrum Methods 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 238000009529 body temperature measurement Methods 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002329 infrared spectrum Methods 0.000 description 2
- 238000010606 normalization Methods 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 206010002091 Anaesthesia Diseases 0.000 description 1
- 238000012935 Averaging Methods 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 206010012289 Dementia Diseases 0.000 description 1
- 238000004566 IR spectroscopy Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000037005 anaesthesia Effects 0.000 description 1
- 239000006117 anti-reflective coating Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000003760 hair shine Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 230000002485 urinary effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
- G01N21/3518—Devices using gas filter correlation techniques; Devices using gas pressure modulation techniques
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/30—Measuring the intensity of spectral lines directly on the spectrum itself
- G01J3/36—Investigating two or more bands of a spectrum by separate detectors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/12—Generating the spectrum; Monochromators
- G01J2003/1213—Filters in general, e.g. dichroic, band
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/314—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry with comparison of measurements at specific and non-specific wavelengths
- G01N2021/3166—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry with comparison of measurements at specific and non-specific wavelengths using separate detectors and filters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
- G01N2021/3531—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis without instrumental source, i.e. radiometric
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/314—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry with comparison of measurements at specific and non-specific wavelengths
Definitions
- IR sensor especially C0 2 sensor
- the invention relates to an IR sensor, in particular a C0 2 sensor, with a filter arrangement, behind which a detector arrangement is arranged, and an evaluation device which is connected to the detector arrangement, the filter arrangement comprising a first filter and a second filter, which act as a bandpass filter Filters are formed and each have a pass band and of which the first filter passes a predetermined IR band and the second filter does not, and the detector arrangement has two detectors, each of which is assigned to a filter.
- Such a sensor which is designed as a gas sensor, is known, for example, from US Pat. No. 5,081,998.
- An IR radiation source is provided there, which acts on a total of four detectors via a filter arrangement.
- the filter arrangement has two filters with different transmission characteristics.
- a first filter has a pass band for IR radiation, which is absorbed by C0 2 .
- This filter is therefore also called “C0 2 filter” for short.
- the detectors arranged behind are called C0 2 detectors.
- the other filter has a different pass band, which is used to determine a reference variable.
- the detectors arranged behind this reference filter are referred to as reference detectors.
- a third filter is arranged, which is referred to as a "natural density filter” and shadows half of the first filter and the second filter. Accordingly, one of the two C0 2 detectors and 10 one of the reference detectors receives only IR radiation that has passed through the "natural density filter” as well as through either the C0 2 filter or the reference filter. The difference between the output signals of the two C0 2 detectors and the dif-
- Such a CO 2 sensor is required, for example, in order to determine CO 2 in the breath of a patient, in order to better monitor the patient during anesthesia
- the C0 concentration in a room should be between 800 ppm and 1200 ppm because at higher concentrations
- the invention is, as explained above, described below with reference to the measurement of C0 2 . But it can also be used with other gases.
- the invention has for its object to simplify the application of an IR sensor.
- the one detector now detects IR radiation with a predetermined spectral range, which also, for example, the absorption spectrum of the
- • - - averaging gas, - -here C0 2 comprises ....
- De -andere detector detects an IR spectrum from a portion of it, the
- the pass band of the first filter is preferably larger than the pass band of the second filter. Accordingly, in addition to the spectral range through which the second filter passes, the first filter also includes the spectral range in which IR radiation is absorbed. - - - - - -. - _ _ -_
- Both filters preferably have a common cutoff wavelength. This simplifies the evaluation. The difference between the output signals of the detectors can then be easily formed without additional calculation steps being required.
- the limit wavelengths are the wavelengths that define the passbands, ie limit them. They are referred to as "start wavelength” and "end wavelength”.
- both filters have the same starting wavelength.
- the "start wavelength” is the wavelength from which the filter emits radiation let through.
- the “same” start wavelength does not have to be identical in the mathematical sense. Usual tolerances, for example 5%, are quite permissible. Such tolerances have an influence on the measurement result. However, this influence is acceptable.
- Both filters are preferably formed by successive filter elements, one filter element being the same for both filters and defining a cutoff wavelength.
- the two filter elements are therefore one behind the other in the radiation direction, i.e. between the source or sources of IR radiation and the detectors.
- the filter arrangement can now be designed such that the "start wavelength” is defined by the filter element, which is the same for both filters, and the "end wavelength", which limits the pass band, is defined by the other two filter elements. This is a simple measure, in order to be able to determine the pass band of both filters with a comparatively high accuracy.
- the first filter advantageously has a pass band which is 0.3 to 0.7 ⁇ m larger than the pass band of the second filter.
- the first filter With the first filter, one basically wants to cover only a relatively narrow wavelength or spectral range of the IR spectrum, namely the range in which IR radiation is absorbed by CO 2 .
- the specified range is sufficient for this.
- the risk that absorption by other gases has a negative influence on the measurement result and falsify it is kept low.
- the first filter has a pass band in the range from 3.6 to 4.5 ⁇ m and the second filter has a pass band in the range from 3.6 to 4.0 ⁇ m.
- the common spectral range is about half as large as the spectral range that the first filter passes through.
- these spectral ranges can of course also be shifted. However, it has been found that these wavelength ranges are favorable for C0 2 .
- the senor uses the natural IR radiation from the surroundings. There is therefore no need for a radiation source which has to be supplied separately and accordingly has a certain power consumption. IR radiation is generally present everywhere, and indeed - even if -. no sunlight shines in. Every body basically has a certain amount of heat radiation. Since you are now on an IR radiation
- Radiation source can be dispensed with, the "measuring range” is also expanded, i.e. larger areas of a room can be monitored for the corresponding gas content. This makes it easier to monitor and adjust a "personal room climate” or "indoor air quality". It is not necessary to lead the air in the room to a sensor and to pass it there between the IR radiation source and the detectors with upstream filters. It is sufficient to place the sensor at a point in the room where it will be monitored
- Air volume can "overlook", so to speak.
- the gas sensor can detect the averaged gas concentration in a simple manner, so to speak.
- the sensor therefore determines an average value, which means a significantly better measurement result, in particular for the personal room climate.
- the sensor can also be used to improve the technology of sensors that work with lamps or other illuminants. If you use natural or ambient IR radiation, you can reduce the energy of the lamp. This leads to longer service intervals and a longer service life.
- the evaluation device preferably normalizes the difference to the signal of the first detector.
- the signal containing the C0 2 content is used for normalization. With this procedure you get a somewhat greater dynamic.
- the filters preferably have CaF 2 , germanium or silicon.
- the silicon preferably has an anti-reflective coating in order to improve the passage.
- 1 is a schematic representation to explain the functional principle of the present invention
- 2 shows a schematic representation of two passbands of two filters
- FIG. 3 shows a schematic representation of the amount of energy that can be detected by detectors
- Fig. 4 is a block diagram for explaining the structure of the gas sensor
- Fig. 5 is a schematic representation of the pass band of two filters
- Fig. 6 is a schematic representation of a preliminary stage of an evaluation signal.
- Fig. 1 shows a schematic representation of a gas sensor 1 for determining the CO 2 content (carbon dioxide content) in a measuring range.
- the measuring range can be, for example, a room or a section of a room in which the personal room climate is to be regulated.
- a sun 3 is shown as a natural IR source. The sun 3 is only used for explanation.
- the gas sensor 1 also works in the absence of sun rays, because in principle practically every body radiates heat and thus generates IR rays.
- the gas molecules 4 absorb IR rays in a certain spectral range, which is indicated by arrows 5 shall be.
- the greater the concentration of C0 2 the lower the energy in a certain spectral range that can be detected in gas sensor 1.
- 4 now shows a block diagram in a schematic illustration to explain the structure of the gas sensor 1.
- the gas sensor 1 has a filter arrangement 6, a detector arrangement 7 and an evaluation device 8. Further details, such as the housing, fastening means or the like, are not shown here.
- the filter arrangement has a first filter 9 and a second filter 10. Both filters have different pass characteristics, which are shown in Fig. 2.
- the first filter has a pass band F1.
- the second filter has a pass band F2.
- Both passbands Fl, F2 start at the - same - lower limit L, -. However, they end differently at their upper limit, namely the pass band Fl at an upper limit Ul and the pass band F2 at an upper limit U2.
- the distance between the upper limit Ul of the first pass band Fl and the upper limit U2 is of the order of about 0.3 to about 0.7 ⁇ m, for example 0.5 ⁇ m.
- the pass band F1 of the first filter 9 In the area in which the pass band F1 of the first filter 9 is larger than the pass band F2 of the second filter 10, there is a spectral range ⁇ (C0 2 ) in which IR radiation from C0 2 is absorbed.
- This spectral range is around 4.2 to 4.3 ⁇ m.
- the upper limit Ul of the first pass - ll - arrange Fl band at about 4.5 microns
- the upper limit U2 of the second passband F2 at about 4.0 microns
- the ⁇ lower limit L the two pass bands Fl, F2 is common to 3.6 microns. 5
- the second filter 10 has a second filter element 12 which defines the upper limit U2 of the second pass band F2.
- a third filter element 13 is provided which defines the lower limit L of the two passbands F1, F2.
- the third filter element 135 has an upper pass limit which lies beyond the upper limit U 1 of the pass band F1 of the first filter 9.
- the first and the second filter element - - ' have a lower-right - pass limit, - which lies below the lower limit L of the third filter element 130.
- the filter arrangement 6 in the area of the first filter 9 passes IR radiation with an energy which is marked with A in FIG. 3.
- This 5 energy is reduced by a proportion C, which is absorbed by C0 2 .
- the filter arrangement 6 allows energy to pass through in the area of the second filter 10, which is marked with B in FIG. 3. This energy is practically constant because it is not influenced by C0 2
- the different energies are now detected by the detector arrangement 7.
- the detector arrangement 7 has a first detector 14, which detects the IR radiation that passes through the first filter 9, and a second detector 15, which detects the IR radiation that passes through the second filter 10.
- the two detectors 14, 15 can be designed as thermoelectric elements, which are also known under the name "thermopiles”.
- each detector Depending on the IR radiation that occurs, each detector generates a voltage or a current, that is to say an electrical quantity that is larger the more IR radiation is incident. Accordingly, the first detector 14 generates a signal S1 and the second detector 15 generates a signal S2.
- thermopile sensor is available, for example, from PerkinElmer Optoelectronics GmbH, D-65199 Wiesbaden, Germany. , , , - _ ..
- thermopile sensor Because the output signal varies with the temperature, a temperature measurement has already been built in around the sensor. Since it is conceivable that a radiation temperature can also be obtained from the room through the sensor, one can immediately obtain an operating temperature based on these two measurements, which can then be used to control the room temperature or something else entirely. In connection with IR it is also conceivable that a measurement of a movement in the room with the sensor is directly possible, which can then be used, for example, to control ventilation, which is only activated, for example, when there is a movement that indicates that there are people in the room. On the basis of various motion measurements, one could also imagine that it would be possible to obtain an estimate of the number of people in the room, this estimate also being applicable for control purposes, so that the
- Room temperature or ventilation is controlled / changed depending on the number of people in the room.
- Both signals S1, S2 are fed to the evaluation device 8. Both signals contain an interference component. It is assumed that the interference component for both detectors 14, 15 is essentially the same. Dement- accordingly -then -then- - - - -
- I C o 2 is the electrical quantity, for example the current or the voltage, which contains the information about the IR radiation
- I ref is the reference quantity which is not influenced by the IR radiation.
- the index n stands for "noise”. If one now forms the difference between S1 and S2, for which a difference former 16 is shown schematically, then a variable is obtained
- This difference S1-S2 is now normalized to the output signal S1 of the first detector 14, so that a signal S3 is obtained.
- This output signal S3 is in turn influenced by the disturbance variable I n .
- This disturbance is negligible.
- FIG. 6 shows the difference between the two pass bands F1, F2 and the absorption spectrum 17 for C0 drawn therein.
- the gas sensor is able to reliably determine CO 2 concentrations in the range from approximately 300 to approximately 1500 ppm.
- the passbands must be moved accordingly. In any case, however, it should be ensured that the passbands overlap in order to allow the greatest possible energy yield to reach the detectors 14, 15.
- a collector can also be arranged in front of the sensor, i.e. a device that collects or bundles IR radiation, for example a collimator. This also improves the sensor.
- Such a sensor can also be used directly for exhaust gas monitoring. For this purpose, it is installed in the chimney or the exhaust. In heating systems in particular, the combustion can then be controlled with the aid of the output signals from the sensor (or from several sensors).
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- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102004028433A DE102004028433B4 (de) | 2004-06-14 | 2004-06-14 | IR-Sensor, insbesondere CO2-Sensor |
| PCT/DK2005/000381 WO2005121751A1 (de) | 2004-06-14 | 2005-06-10 | Ir-sensor, insbesondere co2-sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1759187A1 true EP1759187A1 (de) | 2007-03-07 |
| EP1759187B1 EP1759187B1 (de) | 2015-03-04 |
Family
ID=34969745
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP05748773.8A Expired - Lifetime EP1759187B1 (de) | 2004-06-14 | 2005-06-10 | Ir-sensor, insbesondere co2-sensor |
Country Status (13)
| Country | Link |
|---|---|
| US (1) | US7635845B2 (de) |
| EP (1) | EP1759187B1 (de) |
| JP (1) | JP4671241B2 (de) |
| KR (1) | KR100887208B1 (de) |
| CN (1) | CN100541174C (de) |
| AU (1) | AU2005252746B2 (de) |
| BR (1) | BRPI0512088A (de) |
| CA (1) | CA2569164C (de) |
| DE (1) | DE102004028433B4 (de) |
| MX (1) | MXPA06014559A (de) |
| RU (1) | RU2339020C1 (de) |
| WO (1) | WO2005121751A1 (de) |
| ZA (1) | ZA200609917B (de) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022266736A1 (pt) * | 2021-06-22 | 2022-12-29 | Nabhan Jose Marcos | Dispositivo para renovação do ar na cabine de automóveis |
Families Citing this family (34)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008017521A1 (de) | 2008-04-04 | 2009-10-15 | Rheinmetall Landsysteme Gmbh | ABC-dichtes Fahrzeug mit CO2-Sensoren sowie Verfahren zur Innenraumluftgüteregelung |
| KR101346439B1 (ko) * | 2009-04-17 | 2014-01-10 | 단포스 아이엑스에이 에이/에스 | 방출체의 온도를 측정하기 위해 대역통과 필터를 이용하는 가스 센서 |
| US9329121B2 (en) | 2009-04-17 | 2016-05-03 | Danfoss Ixa A/S | Sensor utilizing band pass filters |
| WO2010118749A1 (en) * | 2009-04-17 | 2010-10-21 | Danfoss Ixa A/S | Gas sensor with filtering sight glass |
| EP2511679A1 (de) * | 2009-12-09 | 2012-10-17 | Panasonic Corporation | Infrarot-flammendetektor |
| WO2011101525A1 (en) * | 2010-02-19 | 2011-08-25 | Vaisala Oyj | Method for calibration of a co2 concentration sensor and a measuring device |
| JP5573340B2 (ja) * | 2010-05-07 | 2014-08-20 | 日本電気株式会社 | ガス検知装置およびガス検知方法 |
| KR102371413B1 (ko) | 2014-06-19 | 2022-03-04 | 단포스 아이엑스에이 에이/에스 | 퍼지 가스 보호를 구비한 가스 센서용 프로브 |
| WO2015193374A1 (en) | 2014-06-19 | 2015-12-23 | Danfoss Ixa A/S | Probe for gas sensor with gas split sample gas flow |
| CN104359852A (zh) * | 2014-11-25 | 2015-02-18 | 云南无线电有限公司 | 一种co、co2、so2三组分红外集成气体传感器 |
| US11249016B2 (en) | 2015-03-02 | 2022-02-15 | Flir Systems Ab | Wavelength band based passive infrared gas imaging |
| CN107532999B (zh) * | 2015-03-02 | 2021-03-23 | 前视红外系统股份公司 | 基于波长带的无源红外气体成像 |
| WO2016138991A1 (en) * | 2015-03-02 | 2016-09-09 | Flir Systems Ab | Quantifying gas in passive optical gas imaging |
| EP3298365B1 (de) * | 2015-05-22 | 2019-05-01 | IRnova AB | Infrarot-bildgebungsdetektor |
| GB2544040B (en) * | 2015-10-19 | 2018-03-14 | Ffe Ltd | Improvements in or relating to flame detectors and associated methods |
| DE102016108545B4 (de) * | 2016-05-09 | 2021-02-04 | Lnfrasolid Gmbh | NDIR-Gassensor und Verfahren zu dessen Kalibrierung |
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- 2005-06-10 AU AU2005252746A patent/AU2005252746B2/en not_active Ceased
- 2005-06-10 EP EP05748773.8A patent/EP1759187B1/de not_active Expired - Lifetime
- 2005-06-10 CN CNB2005800195653A patent/CN100541174C/zh not_active Expired - Fee Related
- 2005-06-10 CA CA2569164A patent/CA2569164C/en not_active Expired - Fee Related
- 2005-06-10 MX MXPA06014559A patent/MXPA06014559A/es active IP Right Grant
- 2005-06-10 KR KR1020077000803A patent/KR100887208B1/ko not_active Expired - Fee Related
- 2005-06-10 RU RU2007100222/28A patent/RU2339020C1/ru active
- 2005-06-10 JP JP2007515776A patent/JP4671241B2/ja not_active Expired - Fee Related
- 2005-06-10 US US11/629,420 patent/US7635845B2/en not_active Expired - Lifetime
- 2005-06-10 BR BRPI0512088-8A patent/BRPI0512088A/pt active Search and Examination
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2006
- 2006-11-28 ZA ZA200609917A patent/ZA200609917B/xx unknown
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| WO2022266736A1 (pt) * | 2021-06-22 | 2022-12-29 | Nabhan Jose Marcos | Dispositivo para renovação do ar na cabine de automóveis |
Also Published As
| Publication number | Publication date |
|---|---|
| KR100887208B1 (ko) | 2009-03-06 |
| US20080283753A1 (en) | 2008-11-20 |
| CN1969180A (zh) | 2007-05-23 |
| WO2005121751A1 (de) | 2005-12-22 |
| RU2007100222A (ru) | 2008-07-20 |
| US7635845B2 (en) | 2009-12-22 |
| EP1759187B1 (de) | 2015-03-04 |
| AU2005252746B2 (en) | 2010-08-05 |
| RU2339020C1 (ru) | 2008-11-20 |
| CA2569164C (en) | 2011-08-23 |
| MXPA06014559A (es) | 2007-05-16 |
| CA2569164A1 (en) | 2005-12-22 |
| JP2008502883A (ja) | 2008-01-31 |
| JP4671241B2 (ja) | 2011-04-13 |
| BRPI0512088A (pt) | 2008-02-06 |
| CN100541174C (zh) | 2009-09-16 |
| DE102004028433A1 (de) | 2006-01-05 |
| DE102004028433B4 (de) | 2006-08-31 |
| AU2005252746A1 (en) | 2005-12-22 |
| ZA200609917B (en) | 2009-05-27 |
| KR20070024724A (ko) | 2007-03-02 |
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